静水圧力処理を受けた多結晶金属材料の塑性変形挙動

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As one of the series of studies on the influence of hydrostatic pressure on the mechanical behavior of polycrystalline metals, the transient behavior of plastic flow stress of prestrained polycrystalline aluminum at atmospheric pressure immediately after hydrostatic pressure soaking of 2000 kg/cm^2 for 1 hour was discussed experimentally in the present paper. From the present study, the following conclusions have been obtained : (1) At reloading after the pressure soaking, it was observed that the yield stress of the metal at reloading decreases transiently in comparison with the flow stress if the metal in the tension test at atmospheric pressure but it returns asymptotically to the original flow curve as the deformation advances. It was also observed that the pressure soaking has no influence on ductility of fracture of polycrystalline aluminum. (2) It was observed that the yield stress at reloading after pressure soaking decreases remarkably with increasing the restrain formed by pulling at atmospheric pressure. This becomes more and more evident for the test specimen with finer grains. (3) As a structural change caused by pressure soaking of the material, the transient increase in number of moving dislocations in the metal resulting from decrease of frictional stress and locking force in the material can be considered. It is suggested that the yield stress at reloading after pressure soaking decreases because of the accelerative effect of moving dislocations. (4) As for the strain-rate dependence of the influence of pressure soaking, it was obtained that the decrease of the yield stress under high strain-rate at reloading after pressure soaking is smaller than that under low strain-rate. This result was explained in terms of the increase of frictional stress caused by the strain-rate dependency of the material.
社団法人日本材料学会の論文
1973-02-15

静水圧力処理を受けた多結晶金属材料の塑性変形挙動

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